configurations/apache/etc/httpd/conf.d/virtualhost-example.apacheconf

<VirtualHost *:443>
  # YOUR CONFIG

  # Redirect all request to a 503 return code when in maintenance mode
  ErrorDocument 503 /maintenance/index.html
  RewriteEngine on
  RewriteCond /var/www/maintenance/ALL -f [OR]
  RewriteCond /var/www/maintenance/%{SERVER_NAME} -f
  RewriteCond %{REQUEST_URI} !=/maintenance/index.html
  RewriteCond %{REQUEST_URI} !=/maintenance/index.png
  RewriteRule ^ - [R=503,L]

  # Redirect away from the maintenance page if not in maintenance mode
  RewriteCond /var/www/maintenance/ALL !-f
  RewriteCond /var/www/maintenance/%{SERVER_NAME} !-f
  RewriteRule ^/maintenance/index.html$ / [R,L]

</VirtualHost>